Form 4

How does it work?

Separation of busbars from the functional units, and separation of all functional units from one another, including the terminals for external conductors which are an integral part of the functional unit.

Terminals for external conductors located in the same compartment as the associated functional unit. Busbar separation is achieved by insulated coverings, eg. Sleeving, wrapping or coatings. Cables may be glanded elsewhere.

Type 1

Terminals for external conductors located in the same compartment as the associated functional unit. Busbar separation is achieved by metallic, or non-metallic, rigid barriers, or partitions. Cables may be glanded elsewhere

Type 2

Terminals for external conductors located in the same compartment as the associated functional unit. Busbar separation is achieved by insulated coverings, eg. Sleeving, wrapping, or coatings. The termination for each functional unit has its own integral glanding facility.

Type 3

Terminals for external conductors located in the same compartment as the associated functional unit, but in individual, separate, enclosed protected spaces, or compartments. Busbar separation is achieved by insulated coverings, eg. Sleeving, wrapping or coatings. Cables may be glanded elsewhere.

Type 4

Terminals for external conductors located in the same compartment as the associated functional unit, but in individual, separate, enclosed protected spaces, or compartments. Busbar separation is achieved by metallic, or non-metallic, rigid barriers, or partitions. Terminals may be separated by insulated coverings, and glanded in common cabling chambers.

Type 5

Terminals for external conductors located in the same compartment as the associated functional unit, but in individual, separate, enclosed protected spaces, or compartments. All separation is by metallic or non-metallic, rigid barriers, or partitions. Cables are glanded in common cabling chamber.

Type 6

Terminals for external conductors located in the same compartment as the associated functional unit, but in individual separate, enclosed protected spaces, or compartments. All separation is by metallic, or non-metallic, rigid barriers, or partitions. The termination for each functional unit has its own integral glanding facility.

Type 7

Type 1 and 2

Incoming

Isolation

Device

Functional Units separated from each other, and busbars, cab;es glanded elsewhere. Terminals associated with Functional Units, to be located in the same compartment as the functional unit.

Type 1 - Separation by insulated coverings.

Type 2 - Separation by metallic, or non-metallic rigid barriers.

Functional

Units

Incoming

Isolation

Device

Functional Units separated from each other, and busbars, cables glanded on the Functional Unit compartment. Terminals associated with Functional Units to be located in the same compartment as the Functional Unit. 

Separation by metallic, or non-metallic rigid barriers.

Functional

Units

Type 3

Incoming

Isolation

Device

Functional Units separated from each other, and busbars, cables glanded on common cabling together. Terminals associated with Functional Units, to be separated from those of other Functional Units, and located in separate compartments.

Type 4 - Busbar separation by insulated coverings.

Type 5 - Busbar separation by metallic, or non-metallic rigid barriers,                    Terminal separation by insulated coverings.

Type 6 - Busbar separation by metallic, or non-metallic rigid barriers.                    Terminal separation by metallic, or non-metallic, rigid barriers

Functional

Units

Type 4, 5 and 6

Enclosure

Terminals for external conductors

Busbars

Internal Barriers

Functional

Unit

Incoming

Isolation

Device

Type 7

Functional

Units

Incoming

Isolation

Device

Functional Units separated from each other, and busbars, cables glanded on Terminal Compartment, Terminals associated with Functional Units, to be separated from those of other Functional Units, and located in separate compartments.

Separation by metallic, or non-metallic rigid barriers.